Oil stove



A ril 6, 1926. 1.579338 R. HOFFMAN OIL STOVE Filed Oct. 12, 1922 2 Sheets-Sheet 1 F/ci/ April 6 1926. 1,579,318

R. HUFFMAN I OIL STOVE Filed Oct. 12, 1922 2 Sheets-Sheet 2 Zg m k M.

Patented Apr. 6, 1926.

" UNITED STATE RUDOLPH HOFFMAN, OF KANKAKEE. ILLINOIS, ASSIGNOR TO SEARS, ROEBUCK AND PATENT OFFICE.

00., OF CHICAGO, ILLINOIS, A CORPORATION OF NEW YORK.

OIL STOVE.

Application filed October 12, 1922'. Serial No. 593,942.-

To all whom it may concem't:

Be it known that I, RUDOLPH HOFFMAN, a citizen of the Uni-ted States, residing at Kankakee, in the county of Kankakee and State of Illinois, have invented a certain new and useful Oil Stove, of which the following is a specification The invention relates to an oil stove of the type embodying a plurality of wickless burners which are controlled by raising and lowering them with respect to an oil supply maintained at a constant level.

The object of my invention is to provide an effectual means for thus raising and lowering the burners of the oil stove, in combination with means for guiding the burners in their movements so as to maintain them at all times in a true horizontal position.

The object of the invention thus stated, together with other and ancillary advantages is attained by the construction and arrangement illustrated in the accompanying drawings forming part hereof in which Figure 1 is a fragmentary front elevational View of a burner equipped with my improved raising and lowering means. Fig. 2 is a fragmentary side elevational view of said means. Fig. 3 is a diagrammatic view illustrating a detail of construction. Fig. 4 is a fragmentary transverse sectional view through the burner and its raising and lowering means and illustrating the connection between the burner and the source of oil supply permitting of the up and down movements of the burner. Fig. 5 is a fragmentary horizontal sectional view taken substantially in the plane of line 5 of Fig. 4.

It will be observed that one embodiment only of the invention has been illustrated but it is contemplated that various changes in the form, construction and arrangement of the parts may be made by those skilled in the art without departing from the spirit and scope of the invention asexpressed in the appended claims.

The burner proper may be of any suitable or preferred construction, Herein I have shown it as comprising a burner bowl 7 which is commonly made annular in form and upon which is supported a chimney or drum 8 for conducting heat produced by the burner to a grid supported in the top frame 9. -The burner bowl is connected with a source of oil supply by means of a depending pipe 10 connected by means of a. flexible tube 11 with a supply pipe 12. The latter V communicates by means of a pipe 13 with an 011 well 14 whlch receives its supply of oil from a reservoir 15 the well and reservoir being supported at one end of the stove and.

being in valve-controlled communication in a manner not herein shown but well known in the art, for the purpose of maintaining a constant oil level with respect to which the burner bowl may be raised and lowered to.

-- pipe 12 by means of a clamp device 18. .19

designates pairs of fingers mounted upon opposite sides of the tube 11 for the purpose of distributing the bending strain over a substantial length of the tube 11. This tube consists of a plurality of relatively movable sections which render it flexible. For a de tailed description of the tube and its asso-. ciated parts, including the clamp 18, reference is made to my copending application Serial No. 540,744 filed March 3, 1922.

One of the essentials for the efficient operation of burners of this character is that the burner bowls be maintained in a true horizontal position as they are raised and lowered,- the reason for this being obvious,that if the burner bowl is inclined the oil therein will not be distributed uni-.

depending from the burner bowl, as well as with the means for raising and lowering the burner, to be now described.

designates a bracket suitably fastened upon a front bar 20 of the framework of the stove. This bracket provides a support for an upright tubular stem 21 rigid with the top wall of the bracket. -The latter is substantially in the form of an inverted U, with the front wall thereof closed and'slotted, as at 22, to receive an indicator 23 fast upon the coupling member 16 and adapted to coact with suitable legends 24 provided on the front face of the wall to indicate the position of the burner.

The stem 21 may be made rigid with the bracket in any suitable way, and is of an internal diameter such as to receive slidably the stem 10. This stem 21 therefore constitutes a guide for the stem 10.

Slidable upon the exterior of the stem 21 is a sleeve or collar 25. The sleeve has a rotatable but non-sliding connection with the upper end of the stem 10 which at the point of its connection with the burner bowl is slightly enlarged as atQG. The means for effecting such connection may be of any suitable or preferred construction. Herein I have shown a collar 27 fast upon the stem 10 and a ring 28 fast upon the upper end of the sleeve and having inwardly projecting fingers 29 slidably engaging with the uppersurface of thecollar 27, said fingers being spaced from the upper end of the sleeve a distance such as to provide grooves or notches for receiving the collar. It will be observed that when up and down move ments are imparted to the sleeve 25, such movements will be transmitted to the stem through this slidable connection.

The means for thus raising and lowering the sleeve preferably is of such construction as to render it possible to raise and lower the burner with substantial ease and speed, and yet is of an extremely simple character. Thus it comprises a member 30 preferably semi-circular or arcuate in form which is mounted upon the bracket 20 as by means of arms 31 rigid with and depending from the opposite sides of the arcuate member. These arms are fastened to the opposite sides of the brackets as by means of screws 32- which also serve to secure the bracket 20 in place upon the bar 20 the latter having apertured lugs 20" for this purpose. Preferably these screws 3:2 are entered through slots in the arms to enable the vertical adjustmentof the member 30.

Rigid with the lower end of the sleeve 21 and extending radially therefrom is an operating rod 3st entered through a slot in the member 30, and carrying a handle 36 at its free end. The slot 35 is approximately helical in shape, extending from one side of the member diagonally around the same to the opposite side thereof. Near its lower portion the inclination of the slot is preferably somewhat less than in its upper portion, as indicated clearly at 37 in Fig. 3; and at its upper end the slot terminates in a short horizontal portion 38 in which the rod is adapted to-engage to hold positively the burner in its extreme elevated position. The shape of the slot is such that when the rod is at its lower extreme position the burner is in its lowermost position and hence the flame produced thereby is highest. This is termed the lighting position. From this position the burner is gradually raised to a medium or normally operative position which is reached when the rod at the upper end of its lower inclined portion 3?. In the movement of the rod from tiiis latter position to its extreme upward position, the burner moved to the out position. These several positions, as illustrated in Fig. 1, are indicated by the pointer 23 coaeting with the legends upon the front face of the bracket.

Preferably I provide means for retarding the movements of the rod with respect to the member, which means may comprise a hearing member -39 engaging with the inner wall of the member 30 (l ig. adjacent the edges of the slot therein. I; spring to encircles the rod and bears between the sleeve and the bearing member serving to provide the necessary frictional engagement between the bearing member and the inner wall of the member 30 to retard the movement of the rod in its slot. Thus by employing a spring of the proper strength the rod may be held thereby in any position in its slot. it will tlltlCfOl'Q be apparent that the use of the upper horizontal portion 'llof the slot is not essential.

It will be seen that T have produced a raising and lowering means of a very practical character, which I havev found to be efiicient in operation in that it results in a substantial saving of time over the period of its use or life, and in that the amount of efort required is relatively small. At the same time the construction extremely simple so that it may be manufactured at a low cost.

I claim as my invention:

1. The combination of an oil receptacle, and means for raising and lowering the receptacle including a pair of telescoping tubular members, a collar fixed upon one of said members, a sleeve loose'upon the other meml'ier and slidably connected with said collar, and means for raising and lowering the sleeve coniprising a stationary arcuate member having a slot therein and a rod rigid with the sleeve operating in said slot.

2. The combination of an oil receptacle, means for raising and lowering the receptacle comprising a stationary arcuate member, a sleeve mounted for up and down movement and having a rotatable but non-sliding connection with the receptacle, the stationary member having a cam slot therein, and a rod rigid with the sleeve and operating in said slot.

The COHll'JlllttflOIl of an oil receptacle having a tubular supply stem depending therefrom, a stationary upright stem providing a guide for said supply stem, a member longitudinally slidable upon the stationary stem and rotatably connected with said tubular stem, a stationary arcuate member having a cam slot therein, and a rod rigid with said rotary member and operating in said slot.

4. The combination of a stationary bracket, a tubular stem mounted on said bracket, an oil supply stem movable through and guided by said tubular stem, an annular member longitudinally and rotatably slidable on said stem and having a rotatable but non-sliding connection with the supply stem, and cam means for raising and lowering said annular member.

5. The combination of a stationary oil supply pipe, a vertically movable feed pipe, a flexible connection between the supply pipe and the lower end of the feed pipe, and combined means for raising and lowering the feed pipe and guiding the same vertically in such movements comprising a stationary stem, an annular member slidable upon said stem, cam means for raising and lowering said annular member, and means operative- 1y connecting the annular member With said feed pipe.

6. The combination of a part movable vertically, a stationary guide stem for said part, a member rotatable on said stem and rotatably connected with said part, a stationary member having a slot therein, a rod operating in said slot and rigid with said movable member, and spring means acting between the movable member and the stationary member to retard the movements of said rod in its slot.

7. The combination of an oil burner, a stationary guide stem, a member rotatable on said stem and rotatably connected with the burner, a stationary member having a slot therein, a rod operating in said slot and rigid with said movable member, a friction member slidable on said rod within the stationary member, and a spring acting between said friction member and the movable member whereby to retard the movements of the rod in said slot.

8. The combination of a stationary upright tubular stem, asleeve rotatable on said stem, a pipe slidable in the stem and having a collar thereon, means on said sleeve providing a notch for receiving said collar, and cam means for raising and lowering the sleeve.

9. The combination of an upright stationary stem, a part guided for up and down movements in said stem and having a collar thereon, a pairof coaxial members one of which is constructed to provide a notch adapted to be engaged by said collar and the other one of which has a cam slot therein, and a rod adapted to engage in said slot and connected with the member which engages the collar whereby to impart up and down movements to saidpart.

10. In an oil stove, the combination of an oil burner having a bowl mounted for up and down movement with respect to a constant level of oil, an oil supply pipe located rearwardly of the burner, means including a flexible tube connecting the burner with said supply pipe, a stationary upright member adapted to guide the burner for vertical movement, and means for raising and lowering the burner comprising a pair of members one of which is stationary and theother one of which is movable up and down and operatively connected with the burner, and cam means acting between said members.

In testimony whereof, I have hereunto affixed my signature.

RUDOLPH HOFFMAN. 

